Electronic Resource
[S.l.]
:
International Union of Crystallography (IUCr)
Acta crystallographica
32 (1976), S. 771-773
ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
Precise measurement of the thermal expansion of natural olivines at elevated temperatures by X-ray diffraction yields the following equations for the cell volume (V) with temperature (t): Fo92.5: Vt = 291.13 + 83.6 × 10-4t + 6.5 × 10-7t2, 25 〈 t 〈 973°C; Fo90.4: Vt = 291.45 + 80.4 × 10-4t + 11.3 × 10-7t2, 25 〈 t 〈 963°C;Fo53.8: Vt = 298.58 + 76.4 × 10-4t + 17.2 × 10-7t2, 25 〈 t 〈 432°C, where the units are Å3 and °C. Similar expressions are reported for the individual lattice parameters. Expressions for thermal expansions are derived. Volume thermal expansion varies linearly with temperature. A decrease in the Mg/Fe ratio in olivine decreases the thermal expansion in the observed temperature range.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739476001575
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